My sd750 will not power up, changed the battery in case it was a battery problem, but no change. Can someone help?My sd750 will not power up, changed the battery in case it was a battery problem, but no change. Can someone help?

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It's not the screen, but its backlight that is the problem. It's likely a poor connection of the ribbon cable in its connector socket. This problem will require either professional repair, or your opening the case to reseat the backlight ribbon cable in its connector. Here's a disassembly of a somewhat similar SD600 to give you an idea of what's involved.

1- Check the battery door indicator switch under the battery door and beside the memory card slot. Is the little black switch damaged or missing? Try pressing down gently using a pen it with the door open and then press the power button. Does it turn on?

2- The fuse has blown and needs to be replaced. Offhand I don't recall where it is on the SD750 PCB or how hard it is to solder on a new one (depends on if its tricky to get at or not). Good thing is fuses are really cheap.

3- Other power problem with the PCB due to corrosion or impact damage. The PCB or 'motherboard' of the camera will need to be replaced.